Rod-packing.



E. E. SWITZER.

ROD PACKING.

APPLICATION FILED SEPT. 11, 1909.

952,769. Patented Mar.22, 1910.

I g Mama rod and its connections.

UnITED STATES PATENT OFFICE.

ELMER E. swrrznn, or HUTTIG, ARKANSAS.

ROD-PACKING.

Specification of Letters Patent. Patented lVIal'. 22, 1910'.

Application filed September 11, 1909. Serial No. 517,272.

cially adapted for piston rods and the like,

and the principal object of the same is to provide a packing'composed of metal and rubber which will automatically expand to compensate for wear. 7

Another object is to provide a packing which may be readily placed in position without, the necessity dismantling the In carrying out the ObJQCtS of the invention generally stated above, it will be understood, of course, that the essential features thereof are necessarily susceptible of changes in details and structural arrange ments, one preferred and practical embodimentof which is shown-in the accompany-i ing drawings, wher'ein Figure 1 is a vertical longitudinal sectional view of a stuffing box and piston rod, showing the box equipped with the improved packin Fig. 2 is a detail perspec tive view of one of the sectional rings of the packin Fig. 3 is an enlarged fragmentary detail end view of one of the sections of the packing rinq. I

Referring to said drawings by numerals,- 1 designates a stuflingbox, 2 the adjustable gland therefor, and 3 the piston rod which passes through the stufling box and gland.

The improved packing forming the subject-matter of this invention is composed of a plurality of rings, each ring being preferably formed of three sectional segments having acentral tubular core 4 of rubber or otherresilient material. The core 4 is surrounded by the four metallic sections 5. each section having a 'concaved seat 6 on its inner face which fits over said core 4, the other surfaces of said sections being flat so that they present smooth flat surfaces to the piston rod '2, the box 1, the gland 3 and also to the sections of adjacent rings; As is shown in Figs. 1 and 2, the outer metallic sections have an opening 7 between theinmeeting faces and the inner sections have a similar opening 8 between their meeting faces, the

openings 7 being in direct communication with the piston rod 3, and the openings 8 being indirect communication with the inner,

longitudinal surface of the stufling box 1.

The gland 9. is held in ildJllSttlblB relation .to the stutling box-1 byv means of the usual bolts 9 and nuts 10.

It will be obvious that the greatest wear is upon the faces of the me allic sections which bear upon the piston rod 3, and it will, therefore, be seen that such wear may be compensated for by adjusting the gland 2, which expands the core 4 to the elliptical shape shown in Fig. 3 and spreads the sections 5 so that they will yieldably bear against the piston rod and the stuffing box. The improved packing may be readily placed around the piston and within the smiling box by disengaging the gland from the box and sliding the gland along the pis ton rod a suflicient distance to permlt 'ee access to sand box. the positioning of the packing within the box being facilitated owing to the fact that each ring is formed in sections.

lVhat- I claim as my invention is 1. A rod packing comprising a segmental metallic ring. each segment being in sections the inner face of which is provided with a concaved seat. and a resilient core for each segment which is surrounded by said sections.

'A rod packingcomprising a segmental metallic ring, each segment being composed of complemental sections. and a tubular resilient core for each segment which is surrounded by the sections thereof.

A rod packing comprising a segmental ring, each segment being composed of complemental sections having flat outer surfaces and a concaved inner surface. and a tubular ELMER SWITZER.

lVitnesses M. B. Sco'm', C. HOWARD. 

